Scientists have discovered levels of iridium 30 times greater than average in the Cretaceous/Tertiary (KT) boundary, the layer of sedimentary rock laid down at the time of the dinosaur extinction.

Yale graduate student Stephen Chester discovered the last known dinosaur before the catastrophic meteor impact 65 million years ago. Disclaimer: AAAS and EurekAlert! are not responsible for the ...

Alvarez. Specifically, McLean was about to challenge Alvarez’s well-publicized theory that an asteroid had caused the extinction of the dinosaurs and thousands of other species 65 million years ago.

Termed the Cretaceous-Paleogene (also called the K-T and K-P) boundary, the post-impact Earth ... It was Earth’s most recent mass extinction event. The dust particles that blocked the sun ...

Previous studies have posited that the mass extinction that wiped the dinosaurs off the face of ... the related Cretaceous-Paleogene (K-Pg) boundary layer, the international team has demonstrated ...

Earth’s long history has seen an uncountable number of species come and go – but one of the most famous extinction ... (K-Pg) boundary, formerly the Cretaceous-Tertiary (K-T) boundary.

This impact triggered a chain reaction of destructive events, including a rapid climate change that eventually led to the extinction of the non-avian dinosaurs ... across K-Pg boundary sediments ...

Much of this rich life—including all dinosaurs, pterosaurs, pliosaurs, and ammonites—perished in the extinction event at the end of the period 65 million years ago. In fact, the land ...

You might know the Cretaceous Period for big animals such as Tyrannosaurus rex and Triceratops, or for being the end of the age of dinosaurs. But what was the world like in the millions of years ...

“Extinction can mark the end of a dynasty, but we must not forget that our own species might not have evolved if it weren’t for the impact and the timing of events that saw the end of the dinosaurs ..